Already registered? We engineer GVM upgrades for the 6.6L Duramax Silverado 2500HD right here in Queensland, taking it to 5,828 kg. That's over 2 tonnes of payload, nearly three times the factory NB1 figure.
Every package takes the 2500HD to 5,828 kg. Starting with Fox HTO shocks and a reset rear leaf pack. Build on it from there with a lift, airbags or remote reservoir suspension.
Suits: Chevrolet Silverado 2500HD with the 6.6L Duramax, NB1 or NB2 from the factory, including registered trucks. Upgrades over 4,500 kg move an NB1 truck to NB2, which needs an LR licence.
The most affordable way to 5,828 kg, with Fox ride quality front and rear.
For trucks that tow heavy, carry a camper or need more clearance. Built on the base package and priced to your build.
| Spec | Fox engineered GVM5,828 kg GVM | Built engineered GVM5,828 kg GVM |
|---|---|---|
| From | $6,990 | – |
| Suspension | Fox HTO shocks front and rear + rear leaf spring reset | Fox GVM base + lift, airbags or remote reservoir suspension |
| Payload | 2,066 kg | 2,066 kg |
| GCM | 12,474 kg, unchanged | 12,474 kg, unchanged |
| Braked towing | 3,500 / 4,500 kg | 3,500 / 4,500 kg |
| Front axle | 2,540 kg (factory) | 2,540 kg (factory) |
| Rear axle | 3,288 kg (re-rated from 2,994 kg) | 3,288 kg (re-rated from 2,994 kg) |
| Tyre sizes | To suit your build (QLD mod plate) | To suit your build (QLD mod plate) |
| Lift | Factory height | To suit your build |
| Pre or post rego | Post-rego, engineered in QLD | Post-rego, engineered in QLD |
Prices include parts, fitting and Queensland engineering. Wheels and tyres are extra. Your final price is confirmed on your quote.
At 5,828 kg your wheels and tyres need to carry the new axle loads. We'll check what's on the truck and quote load-rated options on the same job if they need to change.
Lifts and bigger tyres can go on the QLD modification plate as part of the same engineering.
The front axle stays at its factory 2,540 kg. As part of the engineering, the rear axle is re-rated from 2,994 kg to 3,288 kg.
The 2500HD is sold here as NB1 at 4,495 kg or NB2 at 5,148 kg. Both can be upgraded to 5,828 kg. On an NB1 truck that's a move to NB2 and an LR licence. On an NB2 truck your licence stays the same.
Fitting a long range fuel tank at the same time? It goes on the same engineering, with no extra engineering fee.
Going over 4,500 kg? An NB1 2500HD moves to NB2, and the driver needs a light rigid (LR) licence. If yours is already an NB2 truck at 5,148 kg, nothing changes. Either way, let your insurer know about the upgrade and keep the certificate with the truck.
One workshop handles the whole job: the kit, the wheels and tyres it needs, the fit and the paperwork.
We look at how you load and use the vehicle: people, fuel, water, drawers, canopy, roof gear and towball weight. If you're not sure where you sit, pop in or give us a call and we'll walk you through it.
We match the kit to the job and quote the load-rated wheels and tyres it needs at the same time, so there are no surprises.
Fitted in our Brendale workshop with the supplier's engineering. Most fits take 2 to 3 days. Chassis extensions take longer.
You leave with the certification paperwork and an alignment set for the new ride height and load.
Yes. It's an engineered modification done after registration. The truck is inspected, the upgrade is designed around its axle, wheel and component ratings, and it's certified by an independent Queensland approved person (engineer). You get a modification certificate and an updated plate.
If your truck is NB1 (4,495 kg), yes. Over 4,500 kg it moves to NB2 and the driver needs a light rigid (LR) licence. If it's already NB2 (5,148 kg), there's no change.
No. GCM and braked towing stay at the factory figures: 12,474 kg GCM, with 3,500 kg braked towing on a 50 mm ball or 4,500 kg on a 70 mm ball. The upgrade gives you payload headroom, so you can load the truck properly and still tow.
The rear leaf pack is re-arched and set up to carry the higher rating. It keeps the truck sitting level when it's loaded, without the cost of a full new pack.
Yes. Lift kits, airbags and remote reservoir suspension can all be added to the base package and go on the same engineering. We'll price it to your build.
Moving to NB2 can change your rego class and cost. Let your insurer know about the upgrade and keep the certificate with the truck. We'll go through it with you before any work starts.
Tell us the year, whether it's NB1 or NB2, how it's set up, what you carry and what you tow. We'll recommend the right package and quote it with wheels and tyres to suit.